Patent GB-568985-A (GB)
Title: A method of and apparatus for internally covering parallel rolled pasteboard cylinders or tubes
IPC: B31C1/00
Filed: 1943-12-21
Abstract: 568,985. Making paper tubes. ZEILER, G. F. Dec. 21, 1943, No. 21431. Convention date, Dec. 21, 1942. [Class 99 (ii)] In a method of and apparatus for making parallel - rolled pasteboard tubes provided with an internal covering layer of parchment, metal foil or the like, a length of pasteboard material is glued on its outer surface and fed towards the winding mandrel, and a length of the covering material corresponding to the internal circumference of the tube plus a small overlap is fed against the inner surface of the pasteboard and caused to adhere thereto, so that when the tube is rolled only the inner layer thereof is covered with the internal covering strip, thus effecting an economy of the covering material. In one embodiment the tube is wound on a mandrel 1 provided with a stripper 5 operated by a cam 7 on a main shaft which rotates once for each tube forming operation. A cutting-off mechanism (not shown) is arranged in front of the mandrel 1. The pasteboard stock passes from a reel 3 through a glueing-device 4 and is fed by rolls 5. The internal covering material is unwound from a roll 9 and is drawn past a glueing apparatus 11 by feed-rolls 17 and passes to a cutting-device 18 and thence over a guide 19 to an adjustable pressing-device 20 where it is attached to the pasteboard strip. The presser and cutting device are actuated from the stripper lever 8 which through linkage reciprocates a frame 21 carrying cams 24, actuating the presser through lever mechanism 26 and a second pair of cams 25, actuating the movable cutting blade. The united strips then pass between rollers 32, 32<1>. The feed rolls 17 of the covering strip are fed intermittently so that the length fed at each operation corresponds to the internal tube circumference. For this purpose, the main shaft is connected to a slidable chain wheel 47, Fig. 3, connected by a pin 48 to a clutch disc 39 carrying a double-pawl 41 which in the Fig. 4 position engages a ratchet wheel 38 driving the feed rolls through gears 35, 36. Adjustable overlapping segments 42, 43, coact with the pawl 41 to lift it clear of the ratchet wheel so that the drive of the feed roller is only eftective while the pawl passes from A to B clear of the segments, while during the remainder of a revolution, from B to A only the pasteboard material is being fed. The segments 42 and 43 are set by a scale in accordance with the ratio between the internal circumference of the tube and the total length of pasteboard to be used per tube. The apparatus is set so that when the leading end of a strip is adjacent the mandrel its trailing end is just behind the presser 20, the cutting-off mechanism of the mandrel being operated at the same time as the presser 20 and cutter 18 while the strip 2 is stationary. If tubes without internal covering are to be produced the feed mechanism for the covering material may be put out of action by withdrawing the bolt 49. In a modification the covering strip may be fed at right angles to the pasteboard strip and the width of the covering strip corresponds to the diameter of the tube. Tubes of different lengths are made by altering the cover strip feed. In this form, Fig. 5 and 7, the cover strip is unwound from a drum 60 and after being glued passes through feed rollers 68 and cutting device 69 to a table 70 below the pasteboard strip 52. The cutting device operates immediately below the edge of the strip 52. A presser device 71 is operated by cam and lever mechanism from a cam 57 on the main shaft in synchronism with the cutting device. The covering strip is fed intermittently through adjustable clutch mechanism similar to that described above, the feed step being equal to the width of the pasteboard strip. In another modification, the glue for attaching the covering strip is applied at the required position to the underside of the pasteboard. The second glueing apparatus comprises a reservoir 91, Fig. 9 and distributing rollers 92, 93. In this case glue is only applied when the strip is forced on to roller 93 by a lever 96 controlled by an exchangeable cam 98 which is timed so that glue is applied to the required part of the pasteboard strip. The intermittent feed of the covering material from a roll 101 is effected by means similar to that shown in Fig. 1. In another modification, the intermittently operative glueing roller 95 is used in a machine in which the cover strip is fed at right angles to the pasteboard strip. In another modification, Fig. 12, the covering material is arranged in a stack 142 of pre-cut pieces. In this form a bracket 138 is vertically adjustable on guide rods and carries ratchet bars 139 coacting with check pawls 140 and with actuating pawls 153 the latter being actuated by lever mechanism from the main cam 127 so that, at each operation, at the moment when the strip is actuated the bracket 138 and pile of sheets is raised and the uppermost sheet is pressed against and attached to the glued surface underneath the pasteboard strip.